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MAX@MOm/AOn electrical contact reinforced phase material, composite electrical contact material and preparation method

An electrical contact material and reinforcing phase technology, applied in the field of composite electrical contact materials and preparation, MAX@MOm/AOn electrical contact reinforcing phase materials, can solve the problem of restricting the industrialization process and damaging the conductivity of Ag/MAX composite materials and other problems, to achieve the effect of remarkable silver saving effect, excellent arc erosion resistance and good processability.

Active Publication Date: 2020-10-27
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the A atoms in the MAX phase are prone to interdiffusion with the Ag matrix, and the interface reaction damages the electrical conductivity of the Ag / MAX composite material, which has a certain gap with commercial Ag / CdO, which limits its industrialization process.

Method used

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  • MAX@MOm/AOn electrical contact reinforced phase material, composite electrical contact material and preparation method
  • MAX@MOm/AOn electrical contact reinforced phase material, composite electrical contact material and preparation method
  • MAX@MOm/AOn electrical contact reinforced phase material, composite electrical contact material and preparation method

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preparation example Construction

[0035] The preparation method of the enhanced phase material of the electric contact, specifically, the oxidation matrix MAX phase material is pre-oxidized in situ on its surface under a controlled atmosphere to generate oxide particles MO m 、AO n or composite oxide layer MO m / AO n , forming MAX@MO m / AO n .

[0036] In situ generation of oxide particles MO on the surface of the parent MAX material by pre-oxidation m 、AO n or composite oxide layer MO m / AO n , can be completed at a lower temperature, low equipment requirements, good repeatability, simple technology, low cost, obvious practical application value, and the shell MO m / AO n The integrated structure with the core MAX has stronger bonding force, strong barrier interface diffusion ability, and better performance of the overall composite material.

[0037] Specifically, the preparation method of the electrical contact reinforcement phase material includes the following steps:

[0038] S1: Weigh the MAX pha...

Embodiment 1

[0056] 10gTi 3 SiC 2 Put the powder into a high-temperature tube furnace, heat up to 1200°C at a heating rate of 10°C / min in an atmosphere of "oxygen + argon" with an oxygen content of 20vol%, keep it warm for 0.5 hours, and cool at a cooling rate of 10°C / min to room temperature, Ti with core-shell structure 3 SiC 2 @TiO 2 Powder; will account for 3% Ti of the overall material mass fraction 3 SiC 2 @TiO 2 Powder and Ag powder with a mass fraction of 97% were wet-mixed for 0.5 hours in a ball mill tank equipped with an ethanol medium (powder: ethanol: ball mass ratio was 1:1:2), and then dried for 1 hour to obtain a mixed powder; The powder was compacted in a cold press at a pressure of 900 MPa and kept for 15 minutes; the block sample was placed in a tube furnace, and the temperature was raised to 500 °C at a heating rate of 2 °C / min under the protection of Ar atmosphere, and kept for 8 hours. That is to get Ag / Ti 3 SiC 2 @TiO 2 Composite electrical contact materials...

Embodiment 2

[0059] 10gTi 3 AlC 2 Put the powder into a high-temperature tube furnace, heat up to 700°C at a heating rate of 2°C / min in an atmosphere of "oxygen + argon" with an oxygen content of 80vol%, keep it warm for 5 hours, and cool at a cooling rate of 5°C / min to room temperature, Ti with a core-shell structure 3 AlC 2 @TiO 2 / Al 2 o 3 Powder; Ti will account for 40% of the overall material mass fraction 3 AlC 2 @TiO 2 / Al 2 o 3 Powder and Ag powder with a mass fraction of 60% were wet-mixed in a ball mill tank equipped with ethanol medium for 8 hours (powder: ethanol: ball mass ratio was 1:3:6), and then dried for 5 hours to obtain a mixed powder; The powder was pressed into a cold press at a pressure of 50 MPa and kept for 1 minute; the block sample was placed in a tube furnace, and the temperature was raised to 900 °C at a heating rate of 16 °C / min under the protection of Ar atmosphere, and kept for 0.5 hours. That is to get Ag / Ti 3 AlC 2 @TiO 2 / Al 2 o 3 Composit...

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Abstract

The invention discloses an MAX@MOm / AOn electrical contact reinforced phase material, a composite electrical contact material and a preparation method. The material is MAX@MOm / AOn with a core-shell structure, the inner core of the MAX@MOm / AOn is a three-dimensional material MAX phase, and the outer shell of the MAX@MOm / AOn is oxide particles MOm, AOn or a composite oxide layer MOm / AOn correspondingto the material of the inner core MAX phase. The Ag / MAX@MOm / AOn composite electrical contact material prepared by adopting the MAX@MOm / AOn prepared by the invention as a reinforcing phase is used forpreparing the Ag / MAX@MOm / AOn composite electrical contact material, the composite material is excellent in electrical conductivity, moderate in hardness and good in processability, can be processed into various electrical contact shapes according to actual application requirements, is excellent in arc erosion resistance and remarkable in silver-saving effect, and the content of a reinforcing phase MAX@MOm / AOn in an Ag matrix accounts for 40 wt% of the composite material at most. The preparation process is simple, good in practicability and suitable for large-scale production, is suitable forlow-voltage switch equipment such as contactors, circuit breakers and relays, and brings social and economic values.

Description

technical field [0001] The invention relates to the technical field of composite electrical contact materials, in particular to a MAX@MO m / AO n Electrical contact reinforcement phase material, composite electrical contact material and preparation method. Background technique [0002] Low-voltage electrical contact materials are an important field of application of electrical alloy materials, and are widely used in control switches such as relays, contactors, and circuit breakers in low-voltage power distribution equipment. At present, the electrical contacts for low-voltage switches are mainly Ag / CdO. Although the arc extinguishing characteristics are outstanding, the Cd vapor generated during the service of Ag / CdO is very harmful to the environment and human body. With the increasingly stringent global environmental protection policies, it is urgent to find alternative materials for Cd-free electrical contacts. Existing Cd-free material Ag / SnO 2 , Ag / ZnO, Ag / Ni, Ag / C, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01H1/0233H01H1/0237H01H11/04C22C5/06C22C32/00C22C1/05
CPCH01H1/0233H01H1/0237H01H11/048C22C5/06C22C32/0005C22C1/05
Inventor 丁健翔张骁查余辉黄培艳陈立明孙正明柳东明张世宏徐东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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